SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2016IMPALA LS, 3.6L ENG VIN NREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/SYSTEM TESTING
2016 Chevrolet Impala LS, 3.6L Eng VIN N

Circuit/System Testing

2016 Chevrolet Impala LS, 3.6L Eng VIN NSECTION Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems» Off
    NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  2. Remove the component: KR5 Rear Defogger Relay
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 85 & Ground
    • If 10 Ω or greater 
    1. Ground Connection» Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 85 & Ground Connection
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  4. Connect a test lamp between the test points: Control circuit terminal 86 & Ground circuit terminal 85
  5. Ignition» On / Vehicle» In Service Mode
  6. Perform the scan tool control function: Rear Defogger» On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle» Off & Remove» Test lamp
    2. Disconnect the electrical connector: X2K33 HVAC Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 86 @ Relay Socket & Ground
      • If less than infinite resistance» Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: Control circuit terminal 86 @ Relay Socket & Terminal 19 X2 @ Control module harness
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Replace the component: K33 HVAC Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle» Off & Remove» Test lamp
    2. Disconnect the electrical connector: K33 HVAC Control Module
    3. Ignition» On / Vehicle» In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 86 @ Relay Socket & Ground
      • If 1 V or greater» Repair the short to voltage on the circuit.
      • If less than 1 V» Replace the component: K33 HVAC Control Module
    • If the test lamp turns On and Off 
  7. Verify a test lamp turns On between the test points: B+ circuit terminal 30 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle» Off & Remove» Test lamp
    2. Test for less than 2 Ω between the test points: B+ circuit terminal 30 @ Relay Socket & Output terminal @ Fuse
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle» Off & Remove» Test lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 30 & Ground
      • If less than infinite resistance» Repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the electrical connector: X1 & X2 E18 Rear Defogger Grid
    4. Test for infinite resistance between the test points: Control circuit terminal 87 @ Relay Socket & Ground
      • If less than infinite resistance» Repair the short to ground on the circuit.
      • If infinite resistance
    5. Replace the component: Fuse
    6. Install the component: KR5 Rear Defogger Relay
    7. Connect a test lamp between the test points: Control circuit terminal 1 X1 & Ground circuit terminal 1 X2
    8. Ignition» On / Vehicle» In Service Mode
    9. Perform the scan tool control function: Rear Defogger» On and Off

      Verify the test lamp turns On and Off.

      • If the test lamp does not turn On and Off» Test or replace the component: KR5 Rear Defogger Relay
      • If the test lamp turns On and Off» Test or replace the component: E18 Rear Defogger Grid
    • If the test lamp turns On 
  8. Momentarily connect a 40 A fused jumper wire between the test points: B+ circuit terminal 30 & Control circuit terminal 87

    Verify the component does not turn On and Off when connecting and disconnecting the jumper wire: E18 Rear Defogger Grid

    • If the component turns On and Off 

      Test or replace the component: KR5 Rear Defogger Relay

    • If the component does not turn On and Off 
  9. Ignition/Vehicle & All vehicle systems» Off
  10. Install the component: KR5 Rear Defogger Relay
  11. Disconnect the electrical connector: X1 & X2 E18 Rear Defogger Grid
  12. Test for less than 10 Ω between the test points: Ground circuit terminal 1 X2 & Ground
    • If 10 Ω or greater 
    1. Ground Connection» Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 1 X2 @ Component harness & Ground Connection
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  13. Connect a test lamp between the test points: Control circuit terminal 1 X1 & Ground circuit terminal 1 X2
  14. Ignition» On / Vehicle» In Service Mode
  15. Perform the scan tool control function: Rear Defogger» On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 

      Repair the open/high resistance in the circuit: Control circuit

    • If the test lamp is always On 

      Repair the short to voltage on the circuit: Control circuit

    • If the test lamp turns On and Off 
  16. Test or replace the component: E18 Rear Defogger Grid
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.